Liquid Measurement

Gallons Ounces
5 640
4 512
3 384
2 256
How many ounces are in 1 gallon?

There are 128 ounces in 1 gallon. This can be determined by dividing the number of ounces by the number of gallons for any of the given measurements (e.g. 640 ounces divided by 5 gallons is equal to 128 ounces per gallon).